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PARKER WINEMAN, OF MINOOKA, ILLINOIS.

Letters Patent No'. 66.435, dated July 2, 1867 IMPROVED MGDE 0I' PREVENTING GORROSION AT THE JOINTS 0F STEAM-BOILIIR FLUES.

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TO ALL WHOM IT MAY CON CERN Be it known that I, PARKER WINEMAN, of Minooka, in the county'of Grundy, and State of Illinois, have invented an Improvement in Steam-Boiler Flues; and I do hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, in which- Figure 1 is a side view, showing one end ofthe improved flue applied to a section of flue sheet.

Figure 2 is a vertical section through the same. A

Similar'letters of reference indicate corresponding parts in both figures.

i The object of this invention is to prevent leakage of boilers at the junctionsof the iiues orI tubes with the liuc-sheets, by coating or covering the ends ofthe fines, at those points where they pass through the due-sheets, with asubstance` which is less corrodihle than the metal of which the iluesare made, thereby obviating the rapid destruction of the joints, as will be hereinafter describe-d.

To enableothers skilled in the art to understand my invention, I will describe its construction and operation.

In the accompanying drawings I have represented one end of a tube or ue, A, secured to .a tube-sheet, B,

Yin theA usual manner, well known, and coated on its external surface so as to prevent it from readilyrusting and exposing the joint. I shall not confine my invention to any particular mode of riveting or securing the tubes to the sheets, as any of the well-known modes may be adopted. I prefer, however, to adopt the plan shown, on account of its simplicity; and, with my improvement applied to the tubes, their durability. The tubes A being out the proper length and prepared Vready for inserting into a steam boiler, they are set upright in a vat or vessel containing a strong solution of the sulphate of copper, with their ends immersed therein. Then, by means of the voltaic current which is produced by the well-known electrotyp'e process, the copper held in the solution will be deposited upon the ends of the tubes, so as to completely cover them, andprevent the surfaces of these coated ends from being exposed tothe action of the Water in the boiler. This coating or covering ofthe ends of the tubes is indicated at a a in the drawings, where it will be secu that it passes through the hole which is made through the tube-sheet B, and is in contact with the inner edge of this hole'. The metal of which the tube-is made is not exposed to the action of the water in the boiler at the joint, and, consequently, it willnot rust at such point and produce leakage.

I have described the use of copper as a coating for the ends of the tubes as one practical mode of carrying my invention into eiect; but I do not -confine my invention to copper, as other metals, having a less ainity for oxygen, may be used to form the coating. I am aware that copper sleeves have been applied en the'outside of boiler tubes at the extremities in forming the joints, and therefore I do not make a claim broadly t0 covering the ends of boiler dues with plates or sleeves of copper. By my invention," the copper or other lsubstance employed is firmly united to the metal of the tubes, s o that perfect joints can be produced at altrifling cost, and with much less metal than is required when separate sleeves are used, as in the old meth-od.V I have but one joint at euch end of a. lue, while there are two jointsyvhere separate sleeves are employed.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

A boiler tube or Hue, having its end or ends coated or covered with a metal which is less corrodible than the metal of which the tube or flue is made, substantially as described.

i PARKER WINEMAN.

Witnesses:

Luxmann SMITH, H. M. THAYEB. 

